The UK has revoked five export licences for equipment to the Israeli navy because of actions during Israel's Operation Cast Lead in Gaza this year.
The British Foreign office said the exports would now contravene its criteria for arms sales, but denied that it had imposed a partial embargo.
The UK says it does not sell weapons which might be used for internal repression or external aggression.
Israel says its troops complied fully with international law during missions.
The British government has been challenged by human rights groups and members of the UK parliament (Thanks Muna)